it seems the problem has to do with this code in x264.c in the libavcodec
diresctory:
if(avctx->crf){
x4->params.rc.i_rc_method = X264_RC_CRF;
x4->params.rc.i_rf_constant = avctx->crf;
}else if(avctx->cqp > -1){
x4->params.rc.i_rc_method = X264_RC_CQP;
x4->params.rc.i_qp_constant = avctx->cqp;
}
}
// if neither crf nor cqp modes are selected we have to enable the RC
// we do it this way because we cannot check if the bitrate has been set
if(!(avctx->crf || (avctx->cqp > -1))) x4->params.rc.i_rc_method =
X264_RC_ABR;
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